Derrick.



D. F. HOGAN.

DERRICK.

APPLICATION FILED MAR. I6. I9I4.

Patented Apr. 1", 1915.

THE MORRIS PETERS C0., F'HomLITHo WASHINGTON, D. c.

UNFFF@ @VFA :DEER/K.

Specification of Letters Patent.

Patented Apr. 13, 19115.

Application fued March 1e, 1914.. serial No. 824,989.

` To all ywhom t may concern Be it known that l, DENIS F. HOGAN, acitizen of the United States, residing at St. Paul, in the county ofRamsey and State of Minnesota, have invented certain new and usefulllmprovements in Derricks; and l do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention has for its object to provide an improved derrick, and tosuch ends, generally stated, the invention consists of the novel devicesand combination of devices hereinafter described and defined in theclaims. I

The improved derrick hereinafter described, while capable of a moregeneral use, is, nevertheless, especially adapted for use as a portablederrick to be carried, for eX- ample, on a supporting car or truck.

ln the accompanying drawings which illustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a view partly in side elevationand partly in vertical section showing the improved derrick; Fig. 2 is afront elevation showing upper portions of the derrick, other portionsbeing broken away; and Fig. 3 is a detail-in section on the line m3 x3on Fig. 2.

As a traveling support for the derrick, 1 preferably employ a sort of atruck, the body of which is in the form of a box-like shell 1, providedwith truck wheels 2 adapted to run upon rails 3. The box or body 1 isfilled with concrete 4; into lwhich the casing or relatively Xed outerportion of a derrick mast is embedded in a manner which will bepresently described. The car body 1 is shown as provided with anoperators platform 5 secured to one side thereof, and is also shown asprovided with brackets 6 to which arms 7 are adapted to be rigidly butdetachably secured by bolts 8, or other suitable means. The arms 7 maybe applied to either or both sides of the car'and engaged with theground or an object placed on the ground, to increase the stability ofthe car. 11i this improved derrick, the mast is supported entirely fromits lower end, and it is made up of a relatively fixed tubular casingand a relatively movable or rotary mast telescoped thereinto. rThe mastcasing is preferably made up of a heavy metal tube or pipe 9 that isreinforced by a larger or shorter metal tube or pipe 10 that surroundsthe lower end portion thereof. rEhe lower end portions of the casingtubes or pipes 9 and 10 are extended downward within the car box 1, areembedded in the concrete 4L and are telescoped onto the hub of ametallic bearing step 11 that rests on the bottom of 'the said box.Metallic reinforcing rings 12 and an annular bearing 13 surround theouter pipe 10 and are embedded in the concrete 4 with the upper hubportion of the said bearing 13, projecting slightly above the concrete.The numeral 14- indicates tie bolts which connect the upper ring 12 tothe annular bearing 13 and the numeral 15 indicates similar tie boltsthat connect the lower ring 12 to the flange of the bearing step 11. lnthis way, the casing of the mast is very firmly anchored in theconcrete, and

the said casing is made strong at a point where it projects above theconcrete and where it is subject to the greatest bending strain. Also,the great weight of the concrete l gives such stability to the car thatit will support the derrick when it is being used to lift heavy loads.

The stem of the mast is shown as made up of a pipe 16 and a pair oflaterally spaced upright metal bars 17 rigidly secured to the upper endthereof. The pipe 16 is telescoped down through the casing pipe 9 andits lower end rests upon the step bearing 11. lts upper end ispreferably made approximately square at 16n (see Fig. 3) and the bars17, which are preferably channels, are engaged with this squared portionand riveted or bolted rigidly thereto. Guide sheaves 18 and 19 arejournaled on bolts 18a and 19a, respectively, passed through the bars17; and a third guide sheave 20 is anchored to the upper ends of thesaid bars 17 by means of a link 21.

rlhe boom 22, at its lower end, is pivoted to heavy bearing ring 23 thatis journaled on the pipe 10 and rests upon the annular bearing 13. rlhesaid bearing ring 23 is connected by a plurality of tie bars 24:, to anupper bearing ring 25, that is secured to the upper end of the pipe 16of the mast stem, and, as shown, rests upon an annular bearing cap 26secured on the upper end of the pipe 9. ln this way, the upper and lowerbearing rings 23 and 25 are caused to rota together, and with therotatable stem of the mast, and the boom is, therefore, of

course, carried by or caused to oscillate with the stem of the mast.

A cable guiding sheave 27 isjournaled to the boom 22 below its free end,and two cable guiding sheaves 28 and 29 are connected to the outer endof thesaid mast,

` respectively, by sheave supporting links 28a and 29a. Mounted on oneor more of the tie bars 24 that are at the back of the mast, are twoindependently driven or operated windlass drums 8O and 3l, to which,respectively, operating cables 32 and 33 are attached. The cable 32controls the raising and lowering movements of the boom, and it is runfrom the drum 30 over the guide sheaves 1S, 29 and 20, and is attachedto the link 29a. The cable 33 serves to raise and lower theload, and itis passed over the Vsheaves 19, 27 and 28 and under the sheave of thehook-equipped tackle block 34, and its vouter end is attached to thesaid tackle block.

This improved derrick as is evident, is free to rotate completely aroundfrom one position to another and to work at either side or end ror thecarrying truck or supporting car. The derrick is therefore especiallyadapted for use' where a portable derrick is required, either forlifting loads at diiigerentpoints, or for lifting and carrying loadsfrom one place to another.

What I claim is:

1.7In a derrick, the combination with a lrelatively fixed mast casingand aY mast rotatably mounted therein and projecting above the same, oflower and upper bearing rings, the former being pivotally mounted on'said mast casing and the latter being secured to said mast, connectionsbetween the said upper and lower bearing rings for causing the same torotate therewith and with the mast stem, a boom pivotally connected tosaid lower bearing ring at its lower end, Vcable guides on said boom andmast stem, and cables and operating devices for lifting the load and forraising and lowering said boom.

2. The combination with a relatively fixed mast casing and a mastrotatably mounted therein, said mast having a biurcated upper endportion and cable guiding sheaves journaled therein, of a lower bearingring rotatably mounted on said mast casing and connected to rotate withsaid mast, a boom pivotally connected to said lower bearing ring at itslower end, cable operating drums and support therefor connected forrotary movements with said mast and lower bearing ring, and operatingcables extending from said drums over the guide sheaves on the upper endof said mast and connected to the said boom, the one cable serving toraise and lower` the boom and the other to raise and lower the load fromthe boom.

3. The combination with a body of concrete, oi a step bearing embeddedin the lower portion thereof and an annular bearing set into the upperportion thereof, a mast casing Vembedded in said concrete and extendingfrom said step bearing through said annular bearing, a mast rotatablymounted in said casing with its lowei` end resting on said step bearing,a lower bearing ring rotatably mounted on said casing and resting onsaid annular bearing, a boom pivot-ally connected at its lower end tosaid lower bearing ring, connections for causing said lower bearing ringto rotate with said mast, and cables and cable operating drums andguides, one ot' said cables serving to raise and lower said boom and theother to raise and lower the load from said boom.

In testimony whereof I aiix my signature in presence of two witnesses.

DENIS F. HOGAN.

Witnesses:

BERNIER G. wWHEELER, HARRY D. KILGORE.

Copies of thisl pat'eiitmayv be obtained for ve cents each, byaddressing the Commissioner of Patents,

f Washington, D. C.

